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  1. #1
    GasResearch-VT.SE's Avatar
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    Using Sante racing reduction pump (oil side) cone.. down on rpm

    My RPM is down from 8600+ to ~8060 using one of those pump reduction cones...
    I've removed all the spacers to make the cone shorter and this is the rpm result..

    Should I repitch my 15/20 to suit the cone?

    Boost is steady 11 psi @ 8000 with ET137/3
    Ethanol vtech tune

    Its similar to this type.

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  2. #2
    Autism Speaks. Its Time To Listen gOt BoOsT's Avatar
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    it it was me id switch back to the oem and leave it be...its only hindering performance at this point and you dont want to be chasing your tail trying to find rpms.

  3. #3
    GasResearch-VT.SE's Avatar
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    Good advice, thanks. I'll switch back and be done with it.
    I think wear ring clearance (new) caused a lot of the rpm drop too.

  4. #4
    Autism Speaks. Its Time To Listen gOt BoOsT's Avatar
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    No problem

  5. #5
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by GasResearch-VT.SE View Post
    Good advice, thanks. I'll switch back and be done with it.
    I think wear ring clearance (new) caused a lot of the rpm drop too.
    Don't give up on it just yet. I am using a cone such as this on my FZR and the results are incredible, but you have to work for them. You can't just bolt a part on and expect it to work miracles and when it doesn't give up on it.

    These cones work AMAZINGLY well!

    The trick to them is you have to run a larger nozzle ring size than you typically would run. Let's say if you ran an 81mm ring before you want to upgrade to about an 85mm ring and then use the spacers to get the RPM up to where you need them to be. Use more/less spacers as necessary and larger/smaller diameter rings as necessary and tweak the trailing edge of the impeller if you need to.

    The rule of thumb here is to use a larger nozzle ring and push the cone back into the venturi with spacers until you find the sweet spot.

    I spent two days at the water testing nozzle sizes, different spacers and tweaking the impeller until I got my maximum results which was a solid 1.7 mph gain.

    So the moral to this story is spend the time tuning it and the results will reward you

    This R&D adjustable anti-cavitation cone is what I'm using on my FZR. The ones below are for the Sea-Doo pumps and there are different cone kits for different venturi sizes
    http://www.4-tecperformance.com/inde...oducts_id=2115
    http://www.4-tecperformance.com/inde...oducts_id=2117
    http://www.4-tecperformance.com/inde...oducts_id=2116

  6. #6
    GasResearch-VT.SE's Avatar
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    Ok thanks for the tips...

    I have the stock 87mm nozzle with stock steering nozzle.
    I guess this thing was made for 83mm stock nozzle like on 2010 RXTX.

    So might not be suitable, but I thought with an 87mm it would actually be less effective as an rpm control.

    thoughts?

  7. #7
    Site Admin Green Hulk's Avatar
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    First I would try the 87mm nozzle, all cone spacers removed and then try a lower pitched impeller and take it from there.

  8. #8
    GasResearch-VT.SE's Avatar
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    Do you have 2009+ Solas impellers in the greenhulk store that are less than 15/20
    Like 14/19?

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by GasResearch-VT.SE View Post
    Do you have 2009+ Solas impellers in the greenhulk store that are less than 15/20
    Like 14/19?
    I do not, but I do have the Skat impellers in custom pitch sizes. You name the pitch size you need in comments section when ordering
    http://www.4-tecperformance.com/inde...oducts_id=2227

  10. #10
    ecpChris's Avatar
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    Using Sante racing reduction pump (oil side) cone.. down on rpm

    Quote Originally Posted by GasResearch-VT.SE View Post
    Do you have 2009+ Solas impellers in the greenhulk store that are less than 15/20
    Like 14/19?
    Pitch it down or add more power here http://www.4-tecperformance.com/inde...ex&cPath=18_63

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